:root {
  --hub-line: #c7d3e6;
  --hub-text: #102443;
  --hub-blue: #1f3f8b;
  --hub-shadow: 0 12px 34px rgba(8, 43, 115, 0.10);
}

.engineering-hero {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  padding-top: 8.5rem;
}

.engineering-tools-shell {
  width: min(1180px, 100%);
  margin: 2rem auto 0;
  text-align: left;
}

.calculator-hero-copy {
  text-align: center;
}

.calculator-hero-copy h1 {
  margin: 0;
  color: #2f38b8;
  font-size: clamp(2.9rem, 4vw, 4.2rem);
  line-height: 1;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.calculator-hero-copy p {
  margin: 1rem 0 0;
  color: #606a7e;
  font-size: 1.05rem;
  font-weight: 500;
}

.calculator-launcher {
  margin-top: 2.75rem;
}

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  align-items: stretch;
}

.calculator-card {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 84px;
  padding: 1rem 1.1rem;
  border-radius: 14px;
  background: linear-gradient(180deg, #314bff 0%, #2d3ef1 100%);
  box-shadow: 0 10px 20px rgba(46, 63, 232, 0.22);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

.calculator-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(46, 63, 232, 0.26);
  filter: brightness(1.02);
}

.calculator-card:focus-visible {
  outline: 3px solid rgba(49, 75, 255, 0.24);
  outline-offset: 3px;
}

.calculator-card span {
  display: block;
}

@media (max-width: 1100px) {
  .calculator-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .engineering-tools-shell {
    margin-top: 1.5rem;
  }

  .engineering-hero {
    padding-top: 7rem;
  }

  .calculator-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .calculator-card {
    min-height: 72px;
    font-size: 0.96rem;
  }
}